2 * VXLAN: Virtual eXtensible Local Area Network
4 * Copyright (c) 2012-2013 Vyatta Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
31 #include <net/ndisc.h>
33 #include <net/ip_tunnels.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
46 #if IS_ENABLED(CONFIG_IPV6)
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
52 #include <net/dst_metadata.h>
54 #define VXLAN_VERSION "0.1"
56 #define PORT_HASH_BITS 8
57 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61 /* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
65 static unsigned short vxlan_port __read_mostly = 8472;
66 module_param_named(udp_port, vxlan_port, ushort, 0444);
67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
69 static bool log_ecn_error = true;
70 module_param(log_ecn_error, bool, 0644);
71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73 static int vxlan_net_id;
74 static struct rtnl_link_ops vxlan_link_ops;
76 static const u8 all_zeros_mac[ETH_ALEN + 2];
78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
80 /* per-network namespace private data for this module */
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
87 /* Forwarding table entry */
89 struct hlist_node hlist; /* linked list of entries */
91 unsigned long updated; /* jiffies */
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 static struct workqueue_struct *vxlan_wq;
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
109 #if IS_ENABLED(CONFIG_IPV6)
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
113 if (a->sa.sa_family != b->sa.sa_family)
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141 ip->sa.sa_family = AF_INET6;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145 ip->sa.sa_family = AF_INET;
148 return -EAFNOSUPPORT;
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153 const union vxlan_addr *ip)
155 if (ip->sa.sa_family == AF_INET6)
156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
161 #else /* !CONFIG_IPV6 */
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185 ip->sa.sa_family = AF_INET;
188 return -EAFNOSUPPORT;
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
195 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
202 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
213 /* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
232 struct vxlan_sock *vs;
234 flags &= VXLAN_F_RCV_FLAGS;
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238 vxlan_get_sk_family(vs) == family &&
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
247 struct vxlan_dev *vxlan;
249 /* For flow based devices, map all packets to VNI 0 */
250 if (vs->flags & VXLAN_F_COLLECT_METADATA)
253 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254 if (vxlan->default_dst.remote_vni == vni)
261 /* Look up VNI in a per net namespace table */
262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
263 sa_family_t family, __be16 port,
266 struct vxlan_sock *vs;
268 vs = vxlan_find_sock(net, family, port, flags);
272 return vxlan_vs_find_vni(vs, vni);
275 /* Fill in neighbour message in skbuff. */
276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
277 const struct vxlan_fdb *fdb,
278 u32 portid, u32 seq, int type, unsigned int flags,
279 const struct vxlan_rdst *rdst)
281 unsigned long now = jiffies;
282 struct nda_cacheinfo ci;
283 struct nlmsghdr *nlh;
285 bool send_ip, send_eth;
287 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
291 ndm = nlmsg_data(nlh);
292 memset(ndm, 0, sizeof(*ndm));
294 send_eth = send_ip = true;
296 if (type == RTM_GETNEIGH) {
297 ndm->ndm_family = AF_INET;
298 send_ip = !vxlan_addr_any(&rdst->remote_ip);
299 send_eth = !is_zero_ether_addr(fdb->eth_addr);
301 ndm->ndm_family = AF_BRIDGE;
302 ndm->ndm_state = fdb->state;
303 ndm->ndm_ifindex = vxlan->dev->ifindex;
304 ndm->ndm_flags = fdb->flags;
305 ndm->ndm_type = RTN_UNICAST;
307 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
308 nla_put_s32(skb, NDA_LINK_NETNSID,
309 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
310 goto nla_put_failure;
312 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
313 goto nla_put_failure;
315 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
316 goto nla_put_failure;
318 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
319 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320 goto nla_put_failure;
321 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
322 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
340 nlmsg_cancel(skb, nlh);
344 static inline size_t vxlan_nlmsg_size(void)
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
359 struct net *net = dev_net(vxlan->dev);
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
398 struct vxlan_fdb f = {
401 struct vxlan_rdst remote = { };
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
411 u64 value = get_unaligned((u64 *)addr);
413 /* only want 6 bytes */
419 return hash_64(value, FDB_HASH_BITS);
422 /* Hash chain to use given mac address */
423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
426 return &vxlan->fdb_head[eth_hash(mac)];
429 /* Look up Ethernet address in forwarding table */
430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
433 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
436 hlist_for_each_entry_rcu(f, head, hlist) {
437 if (ether_addr_equal(mac, f->eth_addr))
444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
449 f = __vxlan_find_mac(vxlan, mac);
456 /* caller should hold vxlan->hash_lock */
457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
458 union vxlan_addr *ip, __be16 port,
459 __be32 vni, __u32 ifindex)
461 struct vxlan_rdst *rd;
463 list_for_each_entry(rd, &f->remotes, list) {
464 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
465 rd->remote_port == port &&
466 rd->remote_vni == vni &&
467 rd->remote_ifindex == ifindex)
474 /* Replace destination of unicast mac */
475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
476 union vxlan_addr *ip, __be16 port, __be32 vni,
479 struct vxlan_rdst *rd;
481 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
485 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
489 dst_cache_reset(&rd->dst_cache);
491 rd->remote_port = port;
492 rd->remote_vni = vni;
493 rd->remote_ifindex = ifindex;
497 /* Add/update destinations for multicast */
498 static int vxlan_fdb_append(struct vxlan_fdb *f,
499 union vxlan_addr *ip, __be16 port, __be32 vni,
500 __u32 ifindex, struct vxlan_rdst **rdp)
502 struct vxlan_rdst *rd;
504 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
508 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
512 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
522 list_add_tail_rcu(&rd->list, &f->remotes);
528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
530 struct vxlanhdr *vh, size_t hdrlen,
532 struct gro_remcsum *grc,
535 size_t start, offset;
537 if (skb->remcsum_offload)
540 if (!NAPI_GRO_CB(skb)->csum_valid)
543 start = vxlan_rco_start(vni_field);
544 offset = start + vxlan_rco_offset(vni_field);
546 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547 start, offset, grc, nopartial);
549 skb->remcsum_offload = 1;
554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
556 struct udp_offload *uoff)
558 struct sk_buff *p, **pp = NULL;
559 struct vxlanhdr *vh, *vh2;
560 unsigned int hlen, off_vx;
562 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
565 struct gro_remcsum grc;
567 skb_gro_remcsum_init(&grc);
569 off_vx = skb_gro_offset(skb);
570 hlen = off_vx + sizeof(*vh);
571 vh = skb_gro_header_fast(skb, off_vx);
572 if (skb_gro_header_hard(skb, hlen)) {
573 vh = skb_gro_header_slow(skb, hlen, off_vx);
578 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
580 flags = vh->vx_flags;
582 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
586 VXLAN_F_REMCSUM_NOPARTIAL));
592 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
594 for (p = *head; p; p = p->next) {
595 if (!NAPI_GRO_CB(p)->same_flow)
598 vh2 = (struct vxlanhdr *)(p->data + off_vx);
599 if (vh->vx_flags != vh2->vx_flags ||
600 vh->vx_vni != vh2->vx_vni) {
601 NAPI_GRO_CB(p)->same_flow = 0;
606 pp = eth_gro_receive(head, skb);
610 skb_gro_remcsum_cleanup(skb, &grc);
611 NAPI_GRO_CB(skb)->flush |= flush;
616 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
617 struct udp_offload *uoff)
619 udp_tunnel_gro_complete(skb, nhoff);
621 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
624 /* Notify netdevs that UDP port started listening */
625 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
627 struct net_device *dev;
628 struct sock *sk = vs->sock->sk;
629 struct net *net = sock_net(sk);
630 sa_family_t sa_family = vxlan_get_sk_family(vs);
631 __be16 port = inet_sk(sk)->inet_sport;
634 if (sa_family == AF_INET) {
635 err = udp_add_offload(net, &vs->udp_offloads);
637 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
641 for_each_netdev_rcu(net, dev) {
642 if (dev->netdev_ops->ndo_add_vxlan_port)
643 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
649 /* Notify netdevs that UDP port is no more listening */
650 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
652 struct net_device *dev;
653 struct sock *sk = vs->sock->sk;
654 struct net *net = sock_net(sk);
655 sa_family_t sa_family = vxlan_get_sk_family(vs);
656 __be16 port = inet_sk(sk)->inet_sport;
659 for_each_netdev_rcu(net, dev) {
660 if (dev->netdev_ops->ndo_del_vxlan_port)
661 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
666 if (sa_family == AF_INET)
667 udp_del_offload(&vs->udp_offloads);
670 /* Add new entry to forwarding table -- assumes lock held */
671 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
672 const u8 *mac, union vxlan_addr *ip,
673 __u16 state, __u16 flags,
674 __be16 port, __be32 vni, __u32 ifindex,
677 struct vxlan_rdst *rd = NULL;
681 f = __vxlan_find_mac(vxlan, mac);
683 if (flags & NLM_F_EXCL) {
684 netdev_dbg(vxlan->dev,
685 "lost race to create %pM\n", mac);
688 if (f->state != state) {
690 f->updated = jiffies;
693 if (f->flags != ndm_flags) {
694 f->flags = ndm_flags;
695 f->updated = jiffies;
698 if ((flags & NLM_F_REPLACE)) {
699 /* Only change unicasts */
700 if (!(is_multicast_ether_addr(f->eth_addr) ||
701 is_zero_ether_addr(f->eth_addr))) {
702 notify |= vxlan_fdb_replace(f, ip, port, vni,
707 if ((flags & NLM_F_APPEND) &&
708 (is_multicast_ether_addr(f->eth_addr) ||
709 is_zero_ether_addr(f->eth_addr))) {
710 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
718 if (!(flags & NLM_F_CREATE))
721 if (vxlan->cfg.addrmax &&
722 vxlan->addrcnt >= vxlan->cfg.addrmax)
725 /* Disallow replace to add a multicast entry */
726 if ((flags & NLM_F_REPLACE) &&
727 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
730 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
731 f = kmalloc(sizeof(*f), GFP_ATOMIC);
737 f->flags = ndm_flags;
738 f->updated = f->used = jiffies;
739 INIT_LIST_HEAD(&f->remotes);
740 memcpy(f->eth_addr, mac, ETH_ALEN);
742 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
745 hlist_add_head_rcu(&f->hlist,
746 vxlan_fdb_head(vxlan, mac));
751 rd = first_remote_rtnl(f);
752 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
758 static void vxlan_fdb_free(struct rcu_head *head)
760 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
761 struct vxlan_rdst *rd, *nd;
763 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
764 dst_cache_destroy(&rd->dst_cache);
770 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
772 netdev_dbg(vxlan->dev,
773 "delete %pM\n", f->eth_addr);
776 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
778 hlist_del_rcu(&f->hlist);
779 call_rcu(&f->rcu, vxlan_fdb_free);
782 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
783 union vxlan_addr *ip, __be16 *port, __be32 *vni,
786 struct net *net = dev_net(vxlan->dev);
790 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
794 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
795 if (remote->sa.sa_family == AF_INET) {
796 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
797 ip->sa.sa_family = AF_INET;
798 #if IS_ENABLED(CONFIG_IPV6)
800 ip->sin6.sin6_addr = in6addr_any;
801 ip->sa.sa_family = AF_INET6;
807 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
809 *port = nla_get_be16(tb[NDA_PORT]);
811 *port = vxlan->cfg.dst_port;
815 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
817 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
819 *vni = vxlan->default_dst.remote_vni;
822 if (tb[NDA_IFINDEX]) {
823 struct net_device *tdev;
825 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
827 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
828 tdev = __dev_get_by_index(net, *ifindex);
830 return -EADDRNOTAVAIL;
838 /* Add static entry (via netlink) */
839 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
840 struct net_device *dev,
841 const unsigned char *addr, u16 vid, u16 flags)
843 struct vxlan_dev *vxlan = netdev_priv(dev);
844 /* struct net *net = dev_net(vxlan->dev); */
851 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
852 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
857 if (tb[NDA_DST] == NULL)
860 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
864 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
865 return -EAFNOSUPPORT;
867 spin_lock_bh(&vxlan->hash_lock);
868 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
869 port, vni, ifindex, ndm->ndm_flags);
870 spin_unlock_bh(&vxlan->hash_lock);
875 /* Delete entry (via netlink) */
876 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
877 struct net_device *dev,
878 const unsigned char *addr, u16 vid)
880 struct vxlan_dev *vxlan = netdev_priv(dev);
882 struct vxlan_rdst *rd = NULL;
889 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
895 spin_lock_bh(&vxlan->hash_lock);
896 f = vxlan_find_mac(vxlan, addr);
900 if (!vxlan_addr_any(&ip)) {
901 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
908 /* remove a destination if it's not the only one on the list,
909 * otherwise destroy the fdb entry
911 if (rd && !list_is_singular(&f->remotes)) {
912 list_del_rcu(&rd->list);
913 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
918 vxlan_fdb_destroy(vxlan, f);
921 spin_unlock_bh(&vxlan->hash_lock);
926 /* Dump forwarding table */
927 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
928 struct net_device *dev,
929 struct net_device *filter_dev, int idx)
931 struct vxlan_dev *vxlan = netdev_priv(dev);
934 for (h = 0; h < FDB_HASH_SIZE; ++h) {
938 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
939 struct vxlan_rdst *rd;
941 list_for_each_entry_rcu(rd, &f->remotes, list) {
942 if (idx < cb->args[0])
945 err = vxlan_fdb_info(skb, vxlan, f,
946 NETLINK_CB(cb->skb).portid,
963 /* Watch incoming packets to learn mapping between Ethernet address
964 * and Tunnel endpoint.
965 * Return true if packet is bogus and should be dropped.
967 static bool vxlan_snoop(struct net_device *dev,
968 union vxlan_addr *src_ip, const u8 *src_mac)
970 struct vxlan_dev *vxlan = netdev_priv(dev);
973 f = vxlan_find_mac(vxlan, src_mac);
975 struct vxlan_rdst *rdst = first_remote_rcu(f);
977 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
980 /* Don't migrate static entries, drop packets */
981 if (f->state & NUD_NOARP)
986 "%pM migrated from %pIS to %pIS\n",
987 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
989 rdst->remote_ip = *src_ip;
990 f->updated = jiffies;
991 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
993 /* learned new entry */
994 spin_lock(&vxlan->hash_lock);
996 /* close off race between vxlan_flush and incoming packets */
997 if (netif_running(dev))
998 vxlan_fdb_create(vxlan, src_mac, src_ip,
1000 NLM_F_EXCL|NLM_F_CREATE,
1001 vxlan->cfg.dst_port,
1002 vxlan->default_dst.remote_vni,
1004 spin_unlock(&vxlan->hash_lock);
1010 /* See if multicast group is already in use by other ID */
1011 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1013 struct vxlan_dev *vxlan;
1014 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1016 /* The vxlan_sock is only used by dev, leaving group has
1017 * no effect on other vxlan devices.
1019 if (family == AF_INET && dev->vn4_sock &&
1020 atomic_read(&dev->vn4_sock->refcnt) == 1)
1022 #if IS_ENABLED(CONFIG_IPV6)
1023 if (family == AF_INET6 && dev->vn6_sock &&
1024 atomic_read(&dev->vn6_sock->refcnt) == 1)
1028 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1029 if (!netif_running(vxlan->dev) || vxlan == dev)
1032 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1034 #if IS_ENABLED(CONFIG_IPV6)
1035 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1039 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1040 &dev->default_dst.remote_ip))
1043 if (vxlan->default_dst.remote_ifindex !=
1044 dev->default_dst.remote_ifindex)
1053 static void __vxlan_sock_release(struct vxlan_sock *vs)
1055 struct vxlan_net *vn;
1059 if (!atomic_dec_and_test(&vs->refcnt))
1062 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1063 spin_lock(&vn->sock_lock);
1064 hlist_del_rcu(&vs->hlist);
1065 vxlan_notify_del_rx_port(vs);
1066 spin_unlock(&vn->sock_lock);
1068 queue_work(vxlan_wq, &vs->del_work);
1071 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073 __vxlan_sock_release(vxlan->vn4_sock);
1074 #if IS_ENABLED(CONFIG_IPV6)
1075 __vxlan_sock_release(vxlan->vn6_sock);
1079 /* Update multicast group membership when first VNI on
1080 * multicast address is brought up
1082 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1085 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1086 int ifindex = vxlan->default_dst.remote_ifindex;
1089 if (ip->sa.sa_family == AF_INET) {
1090 struct ip_mreqn mreq = {
1091 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1092 .imr_ifindex = ifindex,
1095 sk = vxlan->vn4_sock->sock->sk;
1097 ret = ip_mc_join_group(sk, &mreq);
1099 #if IS_ENABLED(CONFIG_IPV6)
1101 sk = vxlan->vn6_sock->sock->sk;
1103 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1104 &ip->sin6.sin6_addr);
1112 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1113 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1116 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1117 int ifindex = vxlan->default_dst.remote_ifindex;
1120 if (ip->sa.sa_family == AF_INET) {
1121 struct ip_mreqn mreq = {
1122 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1123 .imr_ifindex = ifindex,
1126 sk = vxlan->vn4_sock->sock->sk;
1128 ret = ip_mc_leave_group(sk, &mreq);
1130 #if IS_ENABLED(CONFIG_IPV6)
1132 sk = vxlan->vn6_sock->sock->sk;
1134 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1135 &ip->sin6.sin6_addr);
1143 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1144 struct sk_buff *skb, u32 vxflags)
1146 size_t start, offset;
1148 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1151 start = vxlan_rco_start(unparsed->vx_vni);
1152 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1154 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1157 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1158 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1160 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1161 unparsed->vx_vni &= VXLAN_VNI_MASK;
1165 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1166 struct sk_buff *skb, u32 vxflags,
1167 struct vxlan_metadata *md)
1169 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1170 struct metadata_dst *tun_dst;
1172 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1175 md->gbp = ntohs(gbp->policy_id);
1177 tun_dst = (struct metadata_dst *)skb_dst(skb);
1179 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1180 tun_dst->u.tun_info.options_len = sizeof(*md);
1182 if (gbp->dont_learn)
1183 md->gbp |= VXLAN_GBP_DONT_LEARN;
1185 if (gbp->policy_applied)
1186 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1188 /* In flow-based mode, GBP is carried in dst_metadata */
1189 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1190 skb->mark = md->gbp;
1192 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1195 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1197 struct sk_buff *skb, u32 vxflags)
1199 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1201 /* Need to have Next Protocol set for interfaces in GPE mode. */
1202 if (!gpe->np_applied)
1204 /* "The initial version is 0. If a receiver does not support the
1205 * version indicated it MUST drop the packet.
1207 if (gpe->version != 0)
1209 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1210 * processing MUST occur." However, we don't implement OAM
1211 * processing, thus drop the packet.
1216 switch (gpe->next_protocol) {
1217 case VXLAN_GPE_NP_IPV4:
1218 *protocol = htons(ETH_P_IP);
1220 case VXLAN_GPE_NP_IPV6:
1221 *protocol = htons(ETH_P_IPV6);
1223 case VXLAN_GPE_NP_ETHERNET:
1224 *protocol = htons(ETH_P_TEB);
1230 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1234 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1235 struct vxlan_sock *vs,
1236 struct sk_buff *skb)
1238 union vxlan_addr saddr;
1240 skb_reset_mac_header(skb);
1241 skb->protocol = eth_type_trans(skb, vxlan->dev);
1242 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1244 /* Ignore packet loops (and multicast echo) */
1245 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1248 /* Get address from the outer IP header */
1249 if (vxlan_get_sk_family(vs) == AF_INET) {
1250 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1251 saddr.sa.sa_family = AF_INET;
1252 #if IS_ENABLED(CONFIG_IPV6)
1254 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1255 saddr.sa.sa_family = AF_INET6;
1259 if ((vxlan->flags & VXLAN_F_LEARN) &&
1260 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1266 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1267 struct sk_buff *skb)
1271 if (vxlan_get_sk_family(vs) == AF_INET)
1272 err = IP_ECN_decapsulate(oiph, skb);
1273 #if IS_ENABLED(CONFIG_IPV6)
1275 err = IP6_ECN_decapsulate(oiph, skb);
1278 if (unlikely(err) && log_ecn_error) {
1279 if (vxlan_get_sk_family(vs) == AF_INET)
1280 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1281 &((struct iphdr *)oiph)->saddr,
1282 ((struct iphdr *)oiph)->tos);
1284 net_info_ratelimited("non-ECT from %pI6\n",
1285 &((struct ipv6hdr *)oiph)->saddr);
1290 /* Callback from net/ipv4/udp.c to receive packets */
1291 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1293 struct pcpu_sw_netstats *stats;
1294 struct vxlan_dev *vxlan;
1295 struct vxlan_sock *vs;
1296 struct vxlanhdr unparsed;
1297 struct vxlan_metadata _md;
1298 struct vxlan_metadata *md = &_md;
1299 __be32 protocol = htons(ETH_P_TEB);
1300 bool raw_proto = false;
1303 /* Need UDP and VXLAN header to be present */
1304 if (!pskb_may_pull(skb, VXLAN_HLEN))
1307 unparsed = *vxlan_hdr(skb);
1308 /* VNI flag always required to be set */
1309 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1310 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1311 ntohl(vxlan_hdr(skb)->vx_flags),
1312 ntohl(vxlan_hdr(skb)->vx_vni));
1313 /* Return non vxlan pkt */
1316 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1317 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1319 vs = rcu_dereference_sk_user_data(sk);
1323 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1327 /* For backwards compatibility, only allow reserved fields to be
1328 * used by VXLAN extensions if explicitly requested.
1330 if (vs->flags & VXLAN_F_GPE) {
1331 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1336 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1337 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1340 if (vxlan_collect_metadata(vs)) {
1341 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1342 struct metadata_dst *tun_dst;
1344 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1345 vxlan_vni_to_tun_id(vni), sizeof(*md));
1350 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1352 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1354 memset(md, 0, sizeof(*md));
1357 if (vs->flags & VXLAN_F_REMCSUM_RX)
1358 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1360 if (vs->flags & VXLAN_F_GBP)
1361 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1362 /* Note that GBP and GPE can never be active together. This is
1363 * ensured in vxlan_dev_configure.
1366 if (unparsed.vx_flags || unparsed.vx_vni) {
1367 /* If there are any unprocessed flags remaining treat
1368 * this as a malformed packet. This behavior diverges from
1369 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1370 * in reserved fields are to be ignored. The approach here
1371 * maintains compatibility with previous stack code, and also
1372 * is more robust and provides a little more security in
1373 * adding extensions to VXLAN.
1379 if (!vxlan_set_mac(vxlan, vs, skb))
1382 skb->dev = vxlan->dev;
1383 skb->pkt_type = PACKET_HOST;
1386 oiph = skb_network_header(skb);
1387 skb_reset_network_header(skb);
1389 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1390 ++vxlan->dev->stats.rx_frame_errors;
1391 ++vxlan->dev->stats.rx_errors;
1395 stats = this_cpu_ptr(vxlan->dev->tstats);
1396 u64_stats_update_begin(&stats->syncp);
1397 stats->rx_packets++;
1398 stats->rx_bytes += skb->len;
1399 u64_stats_update_end(&stats->syncp);
1401 gro_cells_receive(&vxlan->gro_cells, skb);
1405 /* Consume bad packet */
1410 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1412 struct vxlan_dev *vxlan = netdev_priv(dev);
1413 struct arphdr *parp;
1416 struct neighbour *n;
1418 if (dev->flags & IFF_NOARP)
1421 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1422 dev->stats.tx_dropped++;
1425 parp = arp_hdr(skb);
1427 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1428 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1429 parp->ar_pro != htons(ETH_P_IP) ||
1430 parp->ar_op != htons(ARPOP_REQUEST) ||
1431 parp->ar_hln != dev->addr_len ||
1434 arpptr = (u8 *)parp + sizeof(struct arphdr);
1436 arpptr += dev->addr_len; /* sha */
1437 memcpy(&sip, arpptr, sizeof(sip));
1438 arpptr += sizeof(sip);
1439 arpptr += dev->addr_len; /* tha */
1440 memcpy(&tip, arpptr, sizeof(tip));
1442 if (ipv4_is_loopback(tip) ||
1443 ipv4_is_multicast(tip))
1446 n = neigh_lookup(&arp_tbl, &tip, dev);
1449 struct vxlan_fdb *f;
1450 struct sk_buff *reply;
1452 if (!(n->nud_state & NUD_CONNECTED)) {
1457 f = vxlan_find_mac(vxlan, n->ha);
1458 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1459 /* bridge-local neighbor */
1464 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1472 skb_reset_mac_header(reply);
1473 __skb_pull(reply, skb_network_offset(reply));
1474 reply->ip_summed = CHECKSUM_UNNECESSARY;
1475 reply->pkt_type = PACKET_HOST;
1477 if (netif_rx_ni(reply) == NET_RX_DROP)
1478 dev->stats.rx_dropped++;
1479 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1480 union vxlan_addr ipa = {
1481 .sin.sin_addr.s_addr = tip,
1482 .sin.sin_family = AF_INET,
1485 vxlan_ip_miss(dev, &ipa);
1489 return NETDEV_TX_OK;
1492 #if IS_ENABLED(CONFIG_IPV6)
1493 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1494 struct neighbour *n, bool isrouter)
1496 struct net_device *dev = request->dev;
1497 struct sk_buff *reply;
1498 struct nd_msg *ns, *na;
1499 struct ipv6hdr *pip6;
1501 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1508 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1509 sizeof(*na) + na_olen + dev->needed_tailroom;
1510 reply = alloc_skb(len, GFP_ATOMIC);
1514 reply->protocol = htons(ETH_P_IPV6);
1516 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1517 skb_push(reply, sizeof(struct ethhdr));
1518 skb_reset_mac_header(reply);
1520 ns = (struct nd_msg *)skb_transport_header(request);
1522 daddr = eth_hdr(request)->h_source;
1523 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1524 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1525 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1526 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1531 /* Ethernet header */
1532 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1533 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1534 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1535 reply->protocol = htons(ETH_P_IPV6);
1537 skb_pull(reply, sizeof(struct ethhdr));
1538 skb_reset_network_header(reply);
1539 skb_put(reply, sizeof(struct ipv6hdr));
1543 pip6 = ipv6_hdr(reply);
1544 memset(pip6, 0, sizeof(struct ipv6hdr));
1546 pip6->priority = ipv6_hdr(request)->priority;
1547 pip6->nexthdr = IPPROTO_ICMPV6;
1548 pip6->hop_limit = 255;
1549 pip6->daddr = ipv6_hdr(request)->saddr;
1550 pip6->saddr = *(struct in6_addr *)n->primary_key;
1552 skb_pull(reply, sizeof(struct ipv6hdr));
1553 skb_reset_transport_header(reply);
1555 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1557 /* Neighbor Advertisement */
1558 memset(na, 0, sizeof(*na)+na_olen);
1559 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1560 na->icmph.icmp6_router = isrouter;
1561 na->icmph.icmp6_override = 1;
1562 na->icmph.icmp6_solicited = 1;
1563 na->target = ns->target;
1564 ether_addr_copy(&na->opt[2], n->ha);
1565 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1566 na->opt[1] = na_olen >> 3;
1568 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1569 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1570 csum_partial(na, sizeof(*na)+na_olen, 0));
1572 pip6->payload_len = htons(sizeof(*na)+na_olen);
1574 skb_push(reply, sizeof(struct ipv6hdr));
1576 reply->ip_summed = CHECKSUM_UNNECESSARY;
1581 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1583 struct vxlan_dev *vxlan = netdev_priv(dev);
1585 const struct ipv6hdr *iphdr;
1586 const struct in6_addr *saddr, *daddr;
1587 struct neighbour *n;
1588 struct inet6_dev *in6_dev;
1590 in6_dev = __in6_dev_get(dev);
1594 iphdr = ipv6_hdr(skb);
1595 saddr = &iphdr->saddr;
1596 daddr = &iphdr->daddr;
1598 msg = (struct nd_msg *)skb_transport_header(skb);
1599 if (msg->icmph.icmp6_code != 0 ||
1600 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1603 if (ipv6_addr_loopback(daddr) ||
1604 ipv6_addr_is_multicast(&msg->target))
1607 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1610 struct vxlan_fdb *f;
1611 struct sk_buff *reply;
1613 if (!(n->nud_state & NUD_CONNECTED)) {
1618 f = vxlan_find_mac(vxlan, n->ha);
1619 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1620 /* bridge-local neighbor */
1625 reply = vxlan_na_create(skb, n,
1626 !!(f ? f->flags & NTF_ROUTER : 0));
1633 if (netif_rx_ni(reply) == NET_RX_DROP)
1634 dev->stats.rx_dropped++;
1636 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1637 union vxlan_addr ipa = {
1638 .sin6.sin6_addr = msg->target,
1639 .sin6.sin6_family = AF_INET6,
1642 vxlan_ip_miss(dev, &ipa);
1647 return NETDEV_TX_OK;
1651 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1653 struct vxlan_dev *vxlan = netdev_priv(dev);
1654 struct neighbour *n;
1656 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1660 switch (ntohs(eth_hdr(skb)->h_proto)) {
1665 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1668 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1669 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1670 union vxlan_addr ipa = {
1671 .sin.sin_addr.s_addr = pip->daddr,
1672 .sin.sin_family = AF_INET,
1675 vxlan_ip_miss(dev, &ipa);
1681 #if IS_ENABLED(CONFIG_IPV6)
1684 struct ipv6hdr *pip6;
1686 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1688 pip6 = ipv6_hdr(skb);
1689 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1690 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1691 union vxlan_addr ipa = {
1692 .sin6.sin6_addr = pip6->daddr,
1693 .sin6.sin6_family = AF_INET6,
1696 vxlan_ip_miss(dev, &ipa);
1710 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1712 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1714 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1723 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1724 struct vxlan_metadata *md)
1726 struct vxlanhdr_gbp *gbp;
1731 gbp = (struct vxlanhdr_gbp *)vxh;
1732 vxh->vx_flags |= VXLAN_HF_GBP;
1734 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1735 gbp->dont_learn = 1;
1737 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1738 gbp->policy_applied = 1;
1740 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1743 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1746 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1748 gpe->np_applied = 1;
1751 case htons(ETH_P_IP):
1752 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1754 case htons(ETH_P_IPV6):
1755 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1757 case htons(ETH_P_TEB):
1758 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1761 return -EPFNOSUPPORT;
1764 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1765 int iphdr_len, __be32 vni,
1766 struct vxlan_metadata *md, u32 vxflags,
1769 struct vxlanhdr *vxh;
1772 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1773 __be16 inner_protocol = htons(ETH_P_TEB);
1775 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1776 skb->ip_summed == CHECKSUM_PARTIAL) {
1777 int csum_start = skb_checksum_start_offset(skb);
1779 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1780 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1781 (skb->csum_offset == offsetof(struct udphdr, check) ||
1782 skb->csum_offset == offsetof(struct tcphdr, check)))
1783 type |= SKB_GSO_TUNNEL_REMCSUM;
1786 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1787 + VXLAN_HLEN + iphdr_len
1788 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1790 /* Need space for new headers (invalidates iph ptr) */
1791 err = skb_cow_head(skb, min_headroom);
1795 skb = vlan_hwaccel_push_inside(skb);
1799 skb = iptunnel_handle_offloads(skb, type);
1801 return PTR_ERR(skb);
1803 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1804 vxh->vx_flags = VXLAN_HF_VNI;
1805 vxh->vx_vni = vxlan_vni_field(vni);
1807 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1810 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1811 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1812 vxh->vx_flags |= VXLAN_HF_RCO;
1814 if (!skb_is_gso(skb)) {
1815 skb->ip_summed = CHECKSUM_NONE;
1816 skb->encapsulation = 0;
1820 if (vxflags & VXLAN_F_GBP)
1821 vxlan_build_gbp_hdr(vxh, vxflags, md);
1822 if (vxflags & VXLAN_F_GPE) {
1823 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1826 inner_protocol = skb->protocol;
1829 skb_set_inner_protocol(skb, inner_protocol);
1837 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1838 struct sk_buff *skb, int oif, u8 tos,
1839 __be32 daddr, __be32 *saddr,
1840 struct dst_cache *dst_cache,
1841 const struct ip_tunnel_info *info)
1843 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1844 struct rtable *rt = NULL;
1850 rt = dst_cache_get_ip4(dst_cache, saddr);
1855 memset(&fl4, 0, sizeof(fl4));
1856 fl4.flowi4_oif = oif;
1857 fl4.flowi4_tos = RT_TOS(tos);
1858 fl4.flowi4_mark = skb->mark;
1859 fl4.flowi4_proto = IPPROTO_UDP;
1861 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1863 rt = ip_route_output_key(vxlan->net, &fl4);
1867 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1872 #if IS_ENABLED(CONFIG_IPV6)
1873 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1874 struct sk_buff *skb, int oif, u8 tos,
1876 const struct in6_addr *daddr,
1877 struct in6_addr *saddr,
1878 struct dst_cache *dst_cache,
1879 const struct ip_tunnel_info *info)
1881 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1882 struct dst_entry *ndst;
1889 ndst = dst_cache_get_ip6(dst_cache, saddr);
1894 memset(&fl6, 0, sizeof(fl6));
1895 fl6.flowi6_oif = oif;
1897 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1898 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1899 fl6.flowi6_mark = skb->mark;
1900 fl6.flowi6_proto = IPPROTO_UDP;
1902 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1903 vxlan->vn6_sock->sock->sk,
1906 return ERR_PTR(err);
1910 dst_cache_set_ip6(dst_cache, ndst, saddr);
1915 /* Bypass encapsulation if the destination is local */
1916 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1917 struct vxlan_dev *dst_vxlan)
1919 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1920 union vxlan_addr loopback;
1921 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1922 struct net_device *dev = skb->dev;
1925 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1926 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1927 skb->pkt_type = PACKET_HOST;
1928 skb->encapsulation = 0;
1929 skb->dev = dst_vxlan->dev;
1930 __skb_pull(skb, skb_network_offset(skb));
1932 if (remote_ip->sa.sa_family == AF_INET) {
1933 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1934 loopback.sa.sa_family = AF_INET;
1935 #if IS_ENABLED(CONFIG_IPV6)
1937 loopback.sin6.sin6_addr = in6addr_loopback;
1938 loopback.sa.sa_family = AF_INET6;
1942 if (dst_vxlan->flags & VXLAN_F_LEARN)
1943 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1945 u64_stats_update_begin(&tx_stats->syncp);
1946 tx_stats->tx_packets++;
1947 tx_stats->tx_bytes += len;
1948 u64_stats_update_end(&tx_stats->syncp);
1950 if (netif_rx(skb) == NET_RX_SUCCESS) {
1951 u64_stats_update_begin(&rx_stats->syncp);
1952 rx_stats->rx_packets++;
1953 rx_stats->rx_bytes += len;
1954 u64_stats_update_end(&rx_stats->syncp);
1956 dev->stats.rx_dropped++;
1960 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1961 struct vxlan_rdst *rdst, bool did_rsc)
1963 struct dst_cache *dst_cache;
1964 struct ip_tunnel_info *info;
1965 struct vxlan_dev *vxlan = netdev_priv(dev);
1967 struct rtable *rt = NULL;
1968 const struct iphdr *old_iph;
1969 union vxlan_addr *dst;
1970 union vxlan_addr remote_ip;
1971 struct vxlan_metadata _md;
1972 struct vxlan_metadata *md = &_md;
1973 __be16 src_port = 0, dst_port;
1978 u32 flags = vxlan->flags;
1979 bool udp_sum = false;
1980 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1982 info = skb_tunnel_info(skb);
1985 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1986 vni = rdst->remote_vni;
1987 dst = &rdst->remote_ip;
1988 dst_cache = &rdst->dst_cache;
1991 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1995 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1996 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1997 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1998 if (remote_ip.sa.sa_family == AF_INET)
1999 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2001 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2003 dst_cache = &info->dst_cache;
2006 if (vxlan_addr_any(dst)) {
2008 /* short-circuited back to local bridge */
2009 vxlan_encap_bypass(skb, vxlan, vxlan);
2015 old_iph = ip_hdr(skb);
2017 ttl = vxlan->cfg.ttl;
2018 if (!ttl && vxlan_addr_multicast(dst))
2021 tos = vxlan->cfg.tos;
2023 tos = ip_tunnel_get_dsfield(old_iph, skb);
2025 label = vxlan->cfg.label;
2026 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2027 vxlan->cfg.port_max, true);
2030 ttl = info->key.ttl;
2031 tos = info->key.tos;
2032 label = info->key.label;
2033 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2035 if (info->options_len)
2036 md = ip_tunnel_info_opts(info);
2038 md->gbp = skb->mark;
2041 if (dst->sa.sa_family == AF_INET) {
2044 if (!vxlan->vn4_sock)
2046 sk = vxlan->vn4_sock->sock->sk;
2048 rt = vxlan_get_route(vxlan, skb,
2049 rdst ? rdst->remote_ifindex : 0, tos,
2050 dst->sin.sin_addr.s_addr, &saddr,
2053 netdev_dbg(dev, "no route to %pI4\n",
2054 &dst->sin.sin_addr.s_addr);
2055 dev->stats.tx_carrier_errors++;
2059 if (rt->dst.dev == dev) {
2060 netdev_dbg(dev, "circular route to %pI4\n",
2061 &dst->sin.sin_addr.s_addr);
2062 dev->stats.collisions++;
2066 /* Bypass encapsulation if the destination is local */
2067 if (rt->rt_flags & RTCF_LOCAL &&
2068 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2069 struct vxlan_dev *dst_vxlan;
2072 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2073 dst->sa.sa_family, dst_port,
2077 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2082 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2083 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2086 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2087 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2088 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2089 vni, md, flags, udp_sum);
2093 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2094 dst->sin.sin_addr.s_addr, tos, ttl, df,
2095 src_port, dst_port, xnet, !udp_sum);
2096 #if IS_ENABLED(CONFIG_IPV6)
2098 struct dst_entry *ndst;
2099 struct in6_addr saddr;
2102 if (!vxlan->vn6_sock)
2104 sk = vxlan->vn6_sock->sock->sk;
2106 ndst = vxlan6_get_route(vxlan, skb,
2107 rdst ? rdst->remote_ifindex : 0, tos,
2108 label, &dst->sin6.sin6_addr, &saddr,
2111 netdev_dbg(dev, "no route to %pI6\n",
2112 &dst->sin6.sin6_addr);
2113 dev->stats.tx_carrier_errors++;
2117 if (ndst->dev == dev) {
2118 netdev_dbg(dev, "circular route to %pI6\n",
2119 &dst->sin6.sin6_addr);
2121 dev->stats.collisions++;
2125 /* Bypass encapsulation if the destination is local */
2126 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2127 if (rt6i_flags & RTF_LOCAL &&
2128 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2129 struct vxlan_dev *dst_vxlan;
2132 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2133 dst->sa.sa_family, dst_port,
2137 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2142 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2144 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2145 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2146 skb_scrub_packet(skb, xnet);
2147 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2148 vni, md, flags, udp_sum);
2153 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2154 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2155 label, src_port, dst_port, !udp_sum);
2162 dev->stats.tx_dropped++;
2166 /* skb is already freed. */
2171 dev->stats.tx_errors++;
2176 /* Transmit local packets over Vxlan
2178 * Outer IP header inherits ECN and DF from inner header.
2179 * Outer UDP destination is the VXLAN assigned port.
2180 * source port is based on hash of flow
2182 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2184 struct vxlan_dev *vxlan = netdev_priv(dev);
2185 const struct ip_tunnel_info *info;
2187 bool did_rsc = false;
2188 struct vxlan_rdst *rdst, *fdst = NULL;
2189 struct vxlan_fdb *f;
2191 info = skb_tunnel_info(skb);
2193 skb_reset_mac_header(skb);
2195 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2196 if (info && info->mode & IP_TUNNEL_INFO_TX)
2197 vxlan_xmit_one(skb, dev, NULL, false);
2200 return NETDEV_TX_OK;
2203 if (vxlan->flags & VXLAN_F_PROXY) {
2205 if (ntohs(eth->h_proto) == ETH_P_ARP)
2206 return arp_reduce(dev, skb);
2207 #if IS_ENABLED(CONFIG_IPV6)
2208 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2209 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2210 + sizeof(struct nd_msg)) &&
2211 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2214 msg = (struct nd_msg *)skb_transport_header(skb);
2215 if (msg->icmph.icmp6_code == 0 &&
2216 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2217 return neigh_reduce(dev, skb);
2223 f = vxlan_find_mac(vxlan, eth->h_dest);
2226 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2227 (ntohs(eth->h_proto) == ETH_P_IP ||
2228 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2229 did_rsc = route_shortcircuit(dev, skb);
2231 f = vxlan_find_mac(vxlan, eth->h_dest);
2235 f = vxlan_find_mac(vxlan, all_zeros_mac);
2237 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2238 !is_multicast_ether_addr(eth->h_dest))
2239 vxlan_fdb_miss(vxlan, eth->h_dest);
2241 dev->stats.tx_dropped++;
2243 return NETDEV_TX_OK;
2247 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2248 struct sk_buff *skb1;
2254 skb1 = skb_clone(skb, GFP_ATOMIC);
2256 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2260 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2263 return NETDEV_TX_OK;
2266 /* Walk the forwarding table and purge stale entries */
2267 static void vxlan_cleanup(unsigned long arg)
2269 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2270 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2273 if (!netif_running(vxlan->dev))
2276 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2277 struct hlist_node *p, *n;
2279 spin_lock_bh(&vxlan->hash_lock);
2280 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2282 = container_of(p, struct vxlan_fdb, hlist);
2283 unsigned long timeout;
2285 if (f->state & NUD_PERMANENT)
2288 timeout = f->used + vxlan->cfg.age_interval * HZ;
2289 if (time_before_eq(timeout, jiffies)) {
2290 netdev_dbg(vxlan->dev,
2291 "garbage collect %pM\n",
2293 f->state = NUD_STALE;
2294 vxlan_fdb_destroy(vxlan, f);
2295 } else if (time_before(timeout, next_timer))
2296 next_timer = timeout;
2298 spin_unlock_bh(&vxlan->hash_lock);
2301 mod_timer(&vxlan->age_timer, next_timer);
2304 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2306 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2307 __be32 vni = vxlan->default_dst.remote_vni;
2309 spin_lock(&vn->sock_lock);
2310 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2311 spin_unlock(&vn->sock_lock);
2314 /* Setup stats when device is created */
2315 static int vxlan_init(struct net_device *dev)
2317 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2324 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2326 struct vxlan_fdb *f;
2328 spin_lock_bh(&vxlan->hash_lock);
2329 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2331 vxlan_fdb_destroy(vxlan, f);
2332 spin_unlock_bh(&vxlan->hash_lock);
2335 static void vxlan_uninit(struct net_device *dev)
2337 struct vxlan_dev *vxlan = netdev_priv(dev);
2339 vxlan_fdb_delete_default(vxlan);
2341 free_percpu(dev->tstats);
2344 /* Start ageing timer and join group when device is brought up */
2345 static int vxlan_open(struct net_device *dev)
2347 struct vxlan_dev *vxlan = netdev_priv(dev);
2350 ret = vxlan_sock_add(vxlan);
2354 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2355 ret = vxlan_igmp_join(vxlan);
2356 if (ret == -EADDRINUSE)
2359 vxlan_sock_release(vxlan);
2364 if (vxlan->cfg.age_interval)
2365 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2370 /* Purge the forwarding table */
2371 static void vxlan_flush(struct vxlan_dev *vxlan)
2375 spin_lock_bh(&vxlan->hash_lock);
2376 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2377 struct hlist_node *p, *n;
2378 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2380 = container_of(p, struct vxlan_fdb, hlist);
2381 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2382 if (!is_zero_ether_addr(f->eth_addr))
2383 vxlan_fdb_destroy(vxlan, f);
2386 spin_unlock_bh(&vxlan->hash_lock);
2389 /* Cleanup timer and forwarding table on shutdown */
2390 static int vxlan_stop(struct net_device *dev)
2392 struct vxlan_dev *vxlan = netdev_priv(dev);
2393 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2396 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2397 !vxlan_group_used(vn, vxlan))
2398 ret = vxlan_igmp_leave(vxlan);
2400 del_timer_sync(&vxlan->age_timer);
2403 vxlan_sock_release(vxlan);
2408 /* Stub, nothing needs to be done. */
2409 static void vxlan_set_multicast_list(struct net_device *dev)
2413 static int __vxlan_change_mtu(struct net_device *dev,
2414 struct net_device *lowerdev,
2415 struct vxlan_rdst *dst, int new_mtu, bool strict)
2417 int max_mtu = IP_MAX_MTU;
2420 max_mtu = lowerdev->mtu;
2422 if (dst->remote_ip.sa.sa_family == AF_INET6)
2423 max_mtu -= VXLAN6_HEADROOM;
2425 max_mtu -= VXLAN_HEADROOM;
2430 if (new_mtu > max_mtu) {
2441 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2443 struct vxlan_dev *vxlan = netdev_priv(dev);
2444 struct vxlan_rdst *dst = &vxlan->default_dst;
2445 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2446 dst->remote_ifindex);
2447 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2450 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2452 struct vxlan_dev *vxlan = netdev_priv(dev);
2453 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2454 __be16 sport, dport;
2456 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2457 vxlan->cfg.port_max, true);
2458 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2460 if (ip_tunnel_info_af(info) == AF_INET) {
2463 if (!vxlan->vn4_sock)
2465 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2466 info->key.u.ipv4.dst,
2467 &info->key.u.ipv4.src, NULL, info);
2472 #if IS_ENABLED(CONFIG_IPV6)
2473 struct dst_entry *ndst;
2475 if (!vxlan->vn6_sock)
2477 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2478 info->key.label, &info->key.u.ipv6.dst,
2479 &info->key.u.ipv6.src, NULL, info);
2481 return PTR_ERR(ndst);
2483 #else /* !CONFIG_IPV6 */
2484 return -EPFNOSUPPORT;
2487 info->key.tp_src = sport;
2488 info->key.tp_dst = dport;
2492 static const struct net_device_ops vxlan_netdev_ether_ops = {
2493 .ndo_init = vxlan_init,
2494 .ndo_uninit = vxlan_uninit,
2495 .ndo_open = vxlan_open,
2496 .ndo_stop = vxlan_stop,
2497 .ndo_start_xmit = vxlan_xmit,
2498 .ndo_get_stats64 = ip_tunnel_get_stats64,
2499 .ndo_set_rx_mode = vxlan_set_multicast_list,
2500 .ndo_change_mtu = vxlan_change_mtu,
2501 .ndo_validate_addr = eth_validate_addr,
2502 .ndo_set_mac_address = eth_mac_addr,
2503 .ndo_fdb_add = vxlan_fdb_add,
2504 .ndo_fdb_del = vxlan_fdb_delete,
2505 .ndo_fdb_dump = vxlan_fdb_dump,
2506 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2509 static const struct net_device_ops vxlan_netdev_raw_ops = {
2510 .ndo_init = vxlan_init,
2511 .ndo_uninit = vxlan_uninit,
2512 .ndo_open = vxlan_open,
2513 .ndo_stop = vxlan_stop,
2514 .ndo_start_xmit = vxlan_xmit,
2515 .ndo_get_stats64 = ip_tunnel_get_stats64,
2516 .ndo_change_mtu = vxlan_change_mtu,
2517 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2520 /* Info for udev, that this is a virtual tunnel endpoint */
2521 static struct device_type vxlan_type = {
2525 /* Calls the ndo_add_vxlan_port of the caller in order to
2526 * supply the listening VXLAN udp ports. Callers are expected
2527 * to implement the ndo_add_vxlan_port.
2529 void vxlan_get_rx_port(struct net_device *dev)
2531 struct vxlan_sock *vs;
2532 struct net *net = dev_net(dev);
2533 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2534 sa_family_t sa_family;
2538 spin_lock(&vn->sock_lock);
2539 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2540 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2541 port = inet_sk(vs->sock->sk)->inet_sport;
2542 sa_family = vxlan_get_sk_family(vs);
2543 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2547 spin_unlock(&vn->sock_lock);
2549 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2551 /* Initialize the device structure. */
2552 static void vxlan_setup(struct net_device *dev)
2554 struct vxlan_dev *vxlan = netdev_priv(dev);
2557 dev->destructor = free_netdev;
2558 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2560 dev->features |= NETIF_F_LLTX;
2561 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2562 dev->features |= NETIF_F_RXCSUM;
2563 dev->features |= NETIF_F_GSO_SOFTWARE;
2565 dev->vlan_features = dev->features;
2566 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2567 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2568 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2569 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2570 netif_keep_dst(dev);
2571 dev->priv_flags |= IFF_NO_QUEUE;
2573 INIT_LIST_HEAD(&vxlan->next);
2574 spin_lock_init(&vxlan->hash_lock);
2576 init_timer_deferrable(&vxlan->age_timer);
2577 vxlan->age_timer.function = vxlan_cleanup;
2578 vxlan->age_timer.data = (unsigned long) vxlan;
2580 vxlan->cfg.dst_port = htons(vxlan_port);
2584 gro_cells_init(&vxlan->gro_cells, dev);
2586 for (h = 0; h < FDB_HASH_SIZE; ++h)
2587 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2590 static void vxlan_ether_setup(struct net_device *dev)
2592 eth_hw_addr_random(dev);
2594 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2595 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2596 dev->netdev_ops = &vxlan_netdev_ether_ops;
2599 static void vxlan_raw_setup(struct net_device *dev)
2601 dev->type = ARPHRD_NONE;
2602 dev->hard_header_len = 0;
2604 dev->mtu = ETH_DATA_LEN;
2605 dev->tx_queue_len = 1000;
2606 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2607 dev->netdev_ops = &vxlan_netdev_raw_ops;
2610 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2611 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2612 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2613 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2614 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2615 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2616 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2617 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2618 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2619 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2620 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2621 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2622 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2623 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2624 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2625 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2626 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2627 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2628 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2629 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2630 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2631 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2632 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2633 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2634 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2635 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2636 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2637 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2640 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2642 if (tb[IFLA_ADDRESS]) {
2643 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2644 pr_debug("invalid link address (not ethernet)\n");
2648 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2649 pr_debug("invalid all zero ethernet address\n");
2650 return -EADDRNOTAVAIL;
2657 if (data[IFLA_VXLAN_ID]) {
2658 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2659 if (id >= VXLAN_VID_MASK)
2663 if (data[IFLA_VXLAN_PORT_RANGE]) {
2664 const struct ifla_vxlan_port_range *p
2665 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2667 if (ntohs(p->high) < ntohs(p->low)) {
2668 pr_debug("port range %u .. %u not valid\n",
2669 ntohs(p->low), ntohs(p->high));
2677 static void vxlan_get_drvinfo(struct net_device *netdev,
2678 struct ethtool_drvinfo *drvinfo)
2680 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2681 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2684 static const struct ethtool_ops vxlan_ethtool_ops = {
2685 .get_drvinfo = vxlan_get_drvinfo,
2686 .get_link = ethtool_op_get_link,
2689 static void vxlan_del_work(struct work_struct *work)
2691 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2692 udp_tunnel_sock_release(vs->sock);
2696 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2697 __be16 port, u32 flags)
2699 struct socket *sock;
2700 struct udp_port_cfg udp_conf;
2703 memset(&udp_conf, 0, sizeof(udp_conf));
2706 udp_conf.family = AF_INET6;
2707 udp_conf.use_udp6_rx_checksums =
2708 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2709 udp_conf.ipv6_v6only = 1;
2711 udp_conf.family = AF_INET;
2714 udp_conf.local_udp_port = port;
2716 /* Open UDP socket */
2717 err = udp_sock_create(net, &udp_conf, &sock);
2719 return ERR_PTR(err);
2724 /* Create new listen socket if needed */
2725 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2726 __be16 port, u32 flags)
2728 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2729 struct vxlan_sock *vs;
2730 struct socket *sock;
2732 struct udp_tunnel_sock_cfg tunnel_cfg;
2734 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2736 return ERR_PTR(-ENOMEM);
2738 for (h = 0; h < VNI_HASH_SIZE; ++h)
2739 INIT_HLIST_HEAD(&vs->vni_list[h]);
2741 INIT_WORK(&vs->del_work, vxlan_del_work);
2743 sock = vxlan_create_sock(net, ipv6, port, flags);
2745 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2748 return ERR_CAST(sock);
2752 atomic_set(&vs->refcnt, 1);
2753 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2755 /* Initialize the vxlan udp offloads structure */
2756 vs->udp_offloads.port = port;
2757 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2758 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2760 spin_lock(&vn->sock_lock);
2761 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2762 vxlan_notify_add_rx_port(vs);
2763 spin_unlock(&vn->sock_lock);
2765 /* Mark socket as an encapsulation socket. */
2766 tunnel_cfg.sk_user_data = vs;
2767 tunnel_cfg.encap_type = 1;
2768 tunnel_cfg.encap_rcv = vxlan_rcv;
2769 tunnel_cfg.encap_destroy = NULL;
2771 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2776 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2778 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2779 struct vxlan_sock *vs = NULL;
2781 if (!vxlan->cfg.no_share) {
2782 spin_lock(&vn->sock_lock);
2783 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2784 vxlan->cfg.dst_port, vxlan->flags);
2785 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2786 spin_unlock(&vn->sock_lock);
2789 spin_unlock(&vn->sock_lock);
2792 vs = vxlan_socket_create(vxlan->net, ipv6,
2793 vxlan->cfg.dst_port, vxlan->flags);
2796 #if IS_ENABLED(CONFIG_IPV6)
2798 vxlan->vn6_sock = vs;
2801 vxlan->vn4_sock = vs;
2802 vxlan_vs_add_dev(vs, vxlan);
2806 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2808 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2809 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2812 vxlan->vn4_sock = NULL;
2813 #if IS_ENABLED(CONFIG_IPV6)
2814 vxlan->vn6_sock = NULL;
2815 if (ipv6 || metadata)
2816 ret = __vxlan_sock_add(vxlan, true);
2818 if (!ret && (!ipv6 || metadata))
2819 ret = __vxlan_sock_add(vxlan, false);
2821 vxlan_sock_release(vxlan);
2825 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2826 struct vxlan_config *conf)
2828 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2829 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2830 struct vxlan_rdst *dst = &vxlan->default_dst;
2831 unsigned short needed_headroom = ETH_HLEN;
2833 bool use_ipv6 = false;
2834 __be16 default_port = vxlan->cfg.dst_port;
2835 struct net_device *lowerdev = NULL;
2837 if (conf->flags & VXLAN_F_GPE) {
2838 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2840 /* For now, allow GPE only together with COLLECT_METADATA.
2841 * This can be relaxed later; in such case, the other side
2842 * of the PtP link will have to be provided.
2844 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2847 vxlan_raw_setup(dev);
2849 vxlan_ether_setup(dev);
2852 vxlan->net = src_net;
2854 dst->remote_vni = conf->vni;
2856 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2858 /* Unless IPv6 is explicitly requested, assume IPv4 */
2859 if (!dst->remote_ip.sa.sa_family)
2860 dst->remote_ip.sa.sa_family = AF_INET;
2862 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2863 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2864 if (!IS_ENABLED(CONFIG_IPV6))
2865 return -EPFNOSUPPORT;
2867 vxlan->flags |= VXLAN_F_IPV6;
2870 if (conf->label && !use_ipv6) {
2871 pr_info("label only supported in use with IPv6\n");
2875 if (conf->remote_ifindex) {
2876 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2877 dst->remote_ifindex = conf->remote_ifindex;
2880 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2884 #if IS_ENABLED(CONFIG_IPV6)
2886 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2887 if (idev && idev->cnf.disable_ipv6) {
2888 pr_info("IPv6 is disabled via sysctl\n");
2895 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2897 needed_headroom = lowerdev->hard_header_len;
2901 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2906 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2907 needed_headroom += VXLAN6_HEADROOM;
2909 needed_headroom += VXLAN_HEADROOM;
2910 dev->needed_headroom = needed_headroom;
2912 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2913 if (!vxlan->cfg.dst_port) {
2914 if (conf->flags & VXLAN_F_GPE)
2915 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2917 vxlan->cfg.dst_port = default_port;
2919 vxlan->flags |= conf->flags;
2921 if (!vxlan->cfg.age_interval)
2922 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2924 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2925 if (tmp->cfg.vni == conf->vni &&
2926 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2927 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2928 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2929 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2930 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2934 dev->ethtool_ops = &vxlan_ethtool_ops;
2936 /* create an fdb entry for a valid default destination */
2937 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2938 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2939 &vxlan->default_dst.remote_ip,
2940 NUD_REACHABLE|NUD_PERMANENT,
2941 NLM_F_EXCL|NLM_F_CREATE,
2942 vxlan->cfg.dst_port,
2943 vxlan->default_dst.remote_vni,
2944 vxlan->default_dst.remote_ifindex,
2950 err = register_netdevice(dev);
2952 vxlan_fdb_delete_default(vxlan);
2956 list_add(&vxlan->next, &vn->vxlan_list);
2961 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2962 u8 name_assign_type, struct vxlan_config *conf)
2964 struct nlattr *tb[IFLA_MAX+1];
2965 struct net_device *dev;
2968 memset(&tb, 0, sizeof(tb));
2970 dev = rtnl_create_link(net, name, name_assign_type,
2971 &vxlan_link_ops, tb);
2975 err = vxlan_dev_configure(net, dev, conf);
2978 return ERR_PTR(err);
2983 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2985 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2986 struct nlattr *tb[], struct nlattr *data[])
2988 struct vxlan_config conf;
2991 memset(&conf, 0, sizeof(conf));
2993 if (data[IFLA_VXLAN_ID])
2994 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2996 if (data[IFLA_VXLAN_GROUP]) {
2997 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2998 } else if (data[IFLA_VXLAN_GROUP6]) {
2999 if (!IS_ENABLED(CONFIG_IPV6))
3000 return -EPFNOSUPPORT;
3002 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3003 conf.remote_ip.sa.sa_family = AF_INET6;
3006 if (data[IFLA_VXLAN_LOCAL]) {
3007 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3008 conf.saddr.sa.sa_family = AF_INET;
3009 } else if (data[IFLA_VXLAN_LOCAL6]) {
3010 if (!IS_ENABLED(CONFIG_IPV6))
3011 return -EPFNOSUPPORT;
3013 /* TODO: respect scope id */
3014 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3015 conf.saddr.sa.sa_family = AF_INET6;
3018 if (data[IFLA_VXLAN_LINK])
3019 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3021 if (data[IFLA_VXLAN_TOS])
3022 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3024 if (data[IFLA_VXLAN_TTL])
3025 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3027 if (data[IFLA_VXLAN_LABEL])
3028 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3029 IPV6_FLOWLABEL_MASK;
3031 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3032 conf.flags |= VXLAN_F_LEARN;
3034 if (data[IFLA_VXLAN_AGEING])
3035 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3037 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
3038 conf.flags |= VXLAN_F_PROXY;
3040 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3041 conf.flags |= VXLAN_F_RSC;
3043 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3044 conf.flags |= VXLAN_F_L2MISS;
3046 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3047 conf.flags |= VXLAN_F_L3MISS;
3049 if (data[IFLA_VXLAN_LIMIT])
3050 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3052 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3053 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3054 conf.flags |= VXLAN_F_COLLECT_METADATA;
3056 if (data[IFLA_VXLAN_PORT_RANGE]) {
3057 const struct ifla_vxlan_port_range *p
3058 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3059 conf.port_min = ntohs(p->low);
3060 conf.port_max = ntohs(p->high);
3063 if (data[IFLA_VXLAN_PORT])
3064 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3066 if (data[IFLA_VXLAN_UDP_CSUM] &&
3067 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3068 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3070 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3071 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3072 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3074 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3075 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3076 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3078 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3079 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3080 conf.flags |= VXLAN_F_REMCSUM_TX;
3082 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3083 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3084 conf.flags |= VXLAN_F_REMCSUM_RX;
3086 if (data[IFLA_VXLAN_GBP])
3087 conf.flags |= VXLAN_F_GBP;
3089 if (data[IFLA_VXLAN_GPE])
3090 conf.flags |= VXLAN_F_GPE;
3092 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3093 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3095 err = vxlan_dev_configure(src_net, dev, &conf);
3098 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3102 pr_info("IPv6 is disabled via sysctl\n");
3106 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3110 pr_info("unsupported combination of extensions\n");
3117 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3119 struct vxlan_dev *vxlan = netdev_priv(dev);
3120 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3122 spin_lock(&vn->sock_lock);
3123 if (!hlist_unhashed(&vxlan->hlist))
3124 hlist_del_rcu(&vxlan->hlist);
3125 spin_unlock(&vn->sock_lock);
3127 gro_cells_destroy(&vxlan->gro_cells);
3128 list_del(&vxlan->next);
3129 unregister_netdevice_queue(dev, head);
3132 static size_t vxlan_get_size(const struct net_device *dev)
3135 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3136 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3137 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3138 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3139 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3140 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3141 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3142 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3143 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3144 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3145 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3146 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3147 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3148 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3149 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3150 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3151 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3152 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3153 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3154 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3155 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3156 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3160 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3162 const struct vxlan_dev *vxlan = netdev_priv(dev);
3163 const struct vxlan_rdst *dst = &vxlan->default_dst;
3164 struct ifla_vxlan_port_range ports = {
3165 .low = htons(vxlan->cfg.port_min),
3166 .high = htons(vxlan->cfg.port_max),
3169 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3170 goto nla_put_failure;
3172 if (!vxlan_addr_any(&dst->remote_ip)) {
3173 if (dst->remote_ip.sa.sa_family == AF_INET) {
3174 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3175 dst->remote_ip.sin.sin_addr.s_addr))
3176 goto nla_put_failure;
3177 #if IS_ENABLED(CONFIG_IPV6)
3179 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3180 &dst->remote_ip.sin6.sin6_addr))
3181 goto nla_put_failure;
3186 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3187 goto nla_put_failure;
3189 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3190 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3191 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3192 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3193 goto nla_put_failure;
3194 #if IS_ENABLED(CONFIG_IPV6)
3196 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3197 &vxlan->cfg.saddr.sin6.sin6_addr))
3198 goto nla_put_failure;
3203 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3204 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3205 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3206 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3207 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3208 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3209 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3210 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3211 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3212 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3213 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3214 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3215 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3216 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3217 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3218 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3219 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3220 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3221 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3222 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3223 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3224 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3225 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3226 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3227 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3228 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3229 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3230 goto nla_put_failure;
3232 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3233 goto nla_put_failure;
3235 if (vxlan->flags & VXLAN_F_GBP &&
3236 nla_put_flag(skb, IFLA_VXLAN_GBP))
3237 goto nla_put_failure;
3239 if (vxlan->flags & VXLAN_F_GPE &&
3240 nla_put_flag(skb, IFLA_VXLAN_GPE))
3241 goto nla_put_failure;
3243 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3244 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3245 goto nla_put_failure;
3253 static struct net *vxlan_get_link_net(const struct net_device *dev)
3255 struct vxlan_dev *vxlan = netdev_priv(dev);
3260 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3262 .maxtype = IFLA_VXLAN_MAX,
3263 .policy = vxlan_policy,
3264 .priv_size = sizeof(struct vxlan_dev),
3265 .setup = vxlan_setup,
3266 .validate = vxlan_validate,
3267 .newlink = vxlan_newlink,
3268 .dellink = vxlan_dellink,
3269 .get_size = vxlan_get_size,
3270 .fill_info = vxlan_fill_info,
3271 .get_link_net = vxlan_get_link_net,
3274 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3275 struct net_device *dev)
3277 struct vxlan_dev *vxlan, *next;
3278 LIST_HEAD(list_kill);
3280 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3281 struct vxlan_rdst *dst = &vxlan->default_dst;
3283 /* In case we created vxlan device with carrier
3284 * and we loose the carrier due to module unload
3285 * we also need to remove vxlan device. In other
3286 * cases, it's not necessary and remote_ifindex
3287 * is 0 here, so no matches.
3289 if (dst->remote_ifindex == dev->ifindex)
3290 vxlan_dellink(vxlan->dev, &list_kill);
3293 unregister_netdevice_many(&list_kill);
3296 static int vxlan_lowerdev_event(struct notifier_block *unused,
3297 unsigned long event, void *ptr)
3299 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3300 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3302 if (event == NETDEV_UNREGISTER)
3303 vxlan_handle_lowerdev_unregister(vn, dev);
3308 static struct notifier_block vxlan_notifier_block __read_mostly = {
3309 .notifier_call = vxlan_lowerdev_event,
3312 static __net_init int vxlan_init_net(struct net *net)
3314 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3317 INIT_LIST_HEAD(&vn->vxlan_list);
3318 spin_lock_init(&vn->sock_lock);
3320 for (h = 0; h < PORT_HASH_SIZE; ++h)
3321 INIT_HLIST_HEAD(&vn->sock_list[h]);
3326 static void __net_exit vxlan_exit_net(struct net *net)
3328 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3329 struct vxlan_dev *vxlan, *next;
3330 struct net_device *dev, *aux;
3334 for_each_netdev_safe(net, dev, aux)
3335 if (dev->rtnl_link_ops == &vxlan_link_ops)
3336 unregister_netdevice_queue(dev, &list);
3338 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3339 /* If vxlan->dev is in the same netns, it has already been added
3340 * to the list by the previous loop.
3342 if (!net_eq(dev_net(vxlan->dev), net)) {
3343 gro_cells_destroy(&vxlan->gro_cells);
3344 unregister_netdevice_queue(vxlan->dev, &list);
3348 unregister_netdevice_many(&list);
3352 static struct pernet_operations vxlan_net_ops = {
3353 .init = vxlan_init_net,
3354 .exit = vxlan_exit_net,
3355 .id = &vxlan_net_id,
3356 .size = sizeof(struct vxlan_net),
3359 static int __init vxlan_init_module(void)
3363 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3367 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3369 rc = register_pernet_subsys(&vxlan_net_ops);
3373 rc = register_netdevice_notifier(&vxlan_notifier_block);
3377 rc = rtnl_link_register(&vxlan_link_ops);
3383 unregister_netdevice_notifier(&vxlan_notifier_block);
3385 unregister_pernet_subsys(&vxlan_net_ops);
3387 destroy_workqueue(vxlan_wq);
3390 late_initcall(vxlan_init_module);
3392 static void __exit vxlan_cleanup_module(void)
3394 rtnl_link_unregister(&vxlan_link_ops);
3395 unregister_netdevice_notifier(&vxlan_notifier_block);
3396 destroy_workqueue(vxlan_wq);
3397 unregister_pernet_subsys(&vxlan_net_ops);
3398 /* rcu_barrier() is called by netns */
3400 module_exit(vxlan_cleanup_module);
3402 MODULE_LICENSE("GPL");
3403 MODULE_VERSION(VXLAN_VERSION);
3404 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3405 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3406 MODULE_ALIAS_RTNL_LINK("vxlan");